I noticed that configuring the kernel with "VIA82CXXX Tuning support (WIP)"
and "Use PCI DMA by default when available" makes my cdrom drive on hdd
inaccessible when using "splitfifo=1".
for example, what happen is:
# mount /dev/sr1 /mnt/cdrom -t iso9660
sr1: CDROM (ioctl) reports ILLEGAL REQUEST.
isofs_read_super: bread failed, dev=0b:01, iso_blknum=16, block=16
mount: wrong fs type, bad option, bad superblock on /dev/sr1,
or too many mounted file systems
I have a via MVP3 (82586B) board with an Ultra ATA capable hard drivee
as hda and an atapi cdrom drive hdd. The problem exists with both
ide-cd and ide-scsi, while disabling any of VIA82CXXX_TUNING,
BLK_DEV_IDEDMA_PCI or splitfifo solves the problem.
I guess config_drive_xfer_rate() in drivers/ide/via82cxxx.c should
be checking the fifo configurations before setting a DMA mode.
Arnd <><
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